Once you have completed your segment outline and marked your keepout areas, it is time to place your solar modules!
Fill Modules
In the segment dropdown menu, select the Arrays option, and then click the big blue button that says Fill Modules.
Once you have filled the roof plane with modules in Portrait, try changing the panel orientation to see if more panels could fit in Landscape.
Manually Place
Once you have filled the segment with modules and are ready to customize your array a bit more, switch the Array Builder Mode to Manual. From here you can add and delete individual panels, as well as determine their orientation on a selective basis.
You can either single click individual modules, or click and drag to create a box that will select any modules touching it.